However, there are some suggestions in Spain that Simeone could be underselling how close Costa is to returning to action, with the Brazilian-born striker spotted in training moments after his manager’s press conference.

Costa was put through his paces in an individual sessions, running and hitting the ball, and could yet be subject to a late fitness test before the trip to the Emirates.

Costa had a good record for Chelsea against Arsenal, netting in the FA Cup final (Picture: Getty)

Asked if he would rest players against Betis, Simeone said: ‘We will do what we always do: play the most important game we have, which is Sunday.

‘We’ll put the footballers who we think can get the best result on the pitch.’